Heat conducting mounting fixture for solid-state lamp
a technology of mounting fixtures and solid-state lamps, which is applied in the direction of fixed installation, discharge tube luminescnet screens, lighting and heating apparatus, etc., can solve the problems of loss of efficiency, hampered by thermal management issues, and paradoxes
Active Publication Date: 2008-02-12
GLOBAL OLED TECH
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Benefits of technology
"The present invention is an organic light-emitting diode lighting apparatus that includes an organic light-emitting diode lamp and a thermally conductive mounting fixture. The apparatus has a continuous thermal contact across the mounting surface, which ensures efficient heat transfer and improved performance. The technical effect of this invention is to provide a reliable and efficient lighting solution that can be used in various lighting applications."
Problems solved by technology
Although LEDs have theoretical efficiency limits far in excess of current incandescent and fluorescent lamps, they still are hampered by thermal management issues.
This seeming paradox exists because existing light bulbs, especially incandescent lamps, convert their waste energy essentially directly into light at near-infrared wavelengths which is radiated from the bulb as out-of-band radiation.
In contrast with incandescent bulbs, which work for the very reason that the filament has been heated to high temperatures, LEDs lose efficiency as the device substrate is heated, further compounding the problem.
This is not the case for future fixtures that will utilize solid-state lamps.
Method used
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Embodiment Construction
[0019]Referring to FIG. 1, a typical incandescent lamp is comprised of a sealed envelope 5 mechanically bonded to an Edison screw base 20. A glass filament support 15 is bonded to the bottom of the envelope and electrical leads (not visible in figure) are brought out through the sealed envelope and attached to the Edison screw base. Electrical current is supplied to filament 10 via the leads attached to the base. The fundamental operating principle of this lamp is that the filament is heated by the supplied electrical current to such a temperature that its black-body emission contains a substantial component in the visible light range. The spectrum of this lamp's radiation can be closely approximated by Planck's formula:
[0020]Pλ=2πhc2λ5(ⅇ(hc / λkt)-1)[0021]Pλ=Power per m2 area per m wavelength[0022]h=Planck's constant (6.626×10−34 Js)[0023]c=Speed of Light (3×108 m / s)[0024]λ=Wavelength (m)[0025]k=Boltzmann Constant (1.38×10−23 J / K)[0026]T=Temperature (K)
Although only about 5% of...
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An organic light-emitting diode lighting apparatus having an organic light-emitting diode lamp having a thermally conductive mounting member having a mounting surface on a first side and second light-emitting surface and a thin-film light-emitting structure adjacent the second light-emitting surface, the thin-film light-emitting structure comprising an anode, a light-emitting layer, and a cathode, and a thermally conductive mounting fixture having a thermally conductive mounting surface on which the thermally conductive mounting member is secured such that there is substantially continuous thermal contact across the mounting surface.
Description
FIELD OF THE INVENTION[0001]This invention pertains to the field of solid-state light-emitting devices and more specifically to fixtures utilizing said devices for general-purpose illumination.BACKGROUND OF THE INVENTION[0002]Light-emitting devices (LEDs), both organic and inorganic, offer the promise of more efficient lighting with concomitant societal benefits that accrue from reduced electrical consumption. Although LEDs have theoretical efficiency limits far in excess of current incandescent and fluorescent lamps, they still are hampered by thermal management issues. This seeming paradox exists because existing light bulbs, especially incandescent lamps, convert their waste energy essentially directly into light at near-infrared wavelengths which is radiated from the bulb as out-of-band radiation. In contrast, solid-state lighting devices such as LEDs convert waste energy into thermal excitation of the device substrate. In contrast with incandescent bulbs, which work for the ver...
Claims
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IPC IPC(8): F21V29/00H01L33/26H01L33/48H01L33/64
CPCF21V29/02F21V29/76F21S8/06F21Y2105/008H01L51/529H01L2924/0002H01L2251/5361H01L2924/00F21Y2105/00F21Y2115/15H10K50/87F21V29/70F21V29/67
Inventor PHELAN, GIANA M.COK, RONALD S.
Owner GLOBAL OLED TECH